Amblyomma. 139 



Male. Body oval, much broader posteriorly ; brownish red, 

 lighter on the marginal ridge; 3 to 3.5 mm. long by 2.5 mm. 

 broad. Dorsal shield slightly convex ; cervical grooves shallow, 

 more so backward ; marginal groove narrow, beginning close to 

 the edge just back of the eye and gradually widening, in front of 

 the II festoons, to the median line behind. Often two light- 

 colored spots (silvery, golden or green) postero-internally to the 

 eyes ; others appear postero-laterally close to the marginal groove 

 and still others on the festoons. Eyes large, flat, yellow to white 

 just behind legs I. Venter ochre-yellow with fine sparse hairs : 

 intestines may show as dark sinuous lines ; genital pore between 

 limbs II and III ; anus slightly in front of the posterior quarter 

 of the body. Stigmata large, whitish, comma-shaped ; with pore 

 small and anteriorly situated. Mandibles with external apophysis 

 bidentate. Dart (hypostome) with three rows of teeth on each 

 side, the median rows close together. Palpi long, thin, the sec- 

 ond article twice as long as the third, I/Cgs moderate size ; coxae 

 I with two spines, the outer one the longer ; coxse II and III 

 have each a short broad spine on the po-^terior border ; coxae IV 

 have each one long strong spine. Tarsi I four times as long as 

 broad, and II to IV three times as long as broad, have each two 

 claws ; pulvillum half as long as the hooks. 



Distribution. This tick has a wide distribution in North and 

 South America attacking cattle especially, but not sparing other 

 animals, nor even man. It may very well become a means of 

 transferring infections, but has not been incriminated in the case 

 of the protozoan fever of cattle. 



TICKS OF UNCERTAIN GENERA. 



I. Scapulatus. Epauletted Tick. A common tick in the 

 woods of Europe and America, distinguished from the /. Redu- 

 ZJZM^ by the shorter rostrum, and by the presence at its base of 

 two additional organs folded like a fan. 



I. Marmorata is distinguished from the /. Reduvius by a 

 slightly shorter rostrum, and by a more graceful thoracic escut- 

 cheon with symmetrical brown spots on a lighter yellowish brown 

 ground. It attacks mammals, and its presence on sheep in 

 louping-ill districts, has led to the charge of carrying the germ of 

 that disease. 



I. Erinaceous and I. Marginatus, white or light colored 



